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What is the actual speed of my "PR" rated processor?
(back to Frequently Asked Questions) (back to Cyrix/IBM 6x86 FAQs) What is the actual speed of my "PR" rated processor?
This is a very common questions, and can be difficult to answer. The best way to tell the true speed of your 6x86 chip is to pull of the heatsink/fan and take a look at it. The MHz rating is printed clearly on all 6x86 chips.
If you don't want to do that, you can reference the chart below. To know the exact speed of the chip, you will need to know the bus speed you are using. You can always take the bus speed and multiply it by the clock multiplier to find out the final frequency of any chip (for example, 75 MHz bus with a 2x clock multiplier would be 75x2, so it would equal 150 MHz).
| PRating: | Bus/Clock: | Speed: |
| PR120 | 50/2 | 100 MHz |
| PR133 | 55/2 | 110 MHz |
| PR150 | 60/2 | 120 MHz |
| PR166 | 66/2 | 133 MHz |
| PR200 | 75/2 | 150 MHz |
Note that the ratings in this table are only for actual chips made. Other bus/clock combinations can be done to theoretically make the same speed and performance.
If this does not answer your question, please refer to the "Support" section of the site.